Ventilator or chimney-cap



(No Model.)

J. H. IRWIN. VENTILATOR 0R GHIMNEY QAP.

Patented. OqtflO, 1882;

u PETERS. nmmm w. Washington, ac.

UNITED STATES PATENT @rrrce.

JOHN H. IRWIN, or MORTON, PENNsYLvANIA.

VENTILATOR OR CHIMNEY-CAP.

SPECIFICATION formingpart of Letters Patent No. 265,814, dated October10, 1882.

' Application filed April 24, 1882. (No model.)

To all whom ct may concern Be it known that I, JOHN H. IRWIN, of Morton,county of Delaware, and State of Pennsylvania, have invented certain newand useful Improvements in Ventilators or Chimney- (laps, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, and to the letters of reference markedthereon.

My invention relates especially to the construction of ejector-capsemployed upon ventilator-shafts and chimneys tor the purpose of insuringa flow of air, gases, products of combustion, &c., therefrom, and hasfor its object the production of a device cheap and simple to constructand effective in operation.

It consists essentially in forming the device of cast-metal platesbearing wings or arms upon their upper surfaces, the edges of said wingsbeing adapted and arranged to fit within grooves formed for theirreception upon the under side of each plate, the whole being securedtogether, and to a section of pipe or the chimneytop by means of screwsor bolts; and my invention involves certain novel and use fulcombinations or arrangements of parts and peculiarities of construction,all of which will be hereinafter first fully described, and then pointedout in the claims.

In the drawings, Figure 1 is a view in clevation of my improved cap.Figs. 2 anti 3 are vertical sectional viewsthereot'. Fig.4tisaplan viewat linew wot Fig.1, and Fig. 5 is a vertical sectional view of amodified form of construction; and Fig. 6 isa plan view ofthe upperplate ofthe cap, (inverted,) showing the location and arrangement of thegrooves formed therein.

Like letters of reference, wherever they occur, indicate correspondingparts in all the figures.

' A is a length of pipe, cast of any suitable material, surmounted by anannular plate, A, cast therewith or attached thereto, said plateextending outward from pipeA at an angle of about forty-five degrees tothe surface thereof. Cast upon the upper side of plate A are wings orarms at, extending upward in a vertical position, their upper edgeshaving a slopecorresponding to the surface of plate A. In the drawings 1have shown three wings, but it is obvious that any number might beemployed.

Upon the interior of pipe A are located eyes B't'or the reception ofbolts or screws 0.

A is an annular plate, correspondingin form to plate A, and havinggrooves a, or project'- ing studs, upon its under surface, below wingsa, for the reception of the upper extremities of the wings upon plate A.

A is a top plate, formed in like manner to plates A and A but closed attop, as plainly shown. Grooves or projections are formed upon its lowersurface, as described in plate A and the top of the plate is perforatedwith bolt-holes corresponding to eyes B.

When the parts are constructed as above described the plates are placedone above the other, the wings upon the first plate fitting into thegrooves, or between the studs upon the under side of the plate above,and the whole surmounted by plate A Bolts 0 are passed through eyes Band the perforations in the top plate, firmly securing all the parts inplace.

If desired, wings (I. might extend downward from the lower side of eachplate, engaging with grooves in the one below, and any number of platesmight be employed.

In Fig. 5 the plates are of the same form and construction as abovedescribed, but pipe A is surmounted by a rib, 1), extending thereaboveand from side to side, said rib being perforated at top for thereception of a bolt, screw, or rivet, (l, for securing the parts inplace. In this form but a single bolt is employed, instead of two, asabove described.

Having now fully described my invention, what I claim as new therein,and desire to secure by Letters Patent, is

1. A ventilator or'chimney cap formed of cast-metal plates, as setforth, bearing wings or arms upon their upper surfaces, the upper edgeswhereof adapted and arranged to fit within grooves formed in the underside of the plate above, said plates being held in place and secured toa section of pipe or the chimney-top, substantially as shown anddescribed.

2. In a ventilator or chimney-cap, pipe A, wherein are located eyes B,said pipe bearing annular plate A, having wings or arms a, plate Ahaving grooves therein or projecting studs thereon, as specified, andbeing provided with v ings or arms a, plate A and bolts or screws G, thewhole combined and arranged substantially as shown and described.

3. In a ventilator or chimney-cap, pipe A, whereon is 'formed a. rib,'D, extending there 5 above and from side to side, substantially asshown and described.

In testimony that I claim the foregoing I have hereunto set my hand inthe presence of two Witnesses.

JOHN H. IRWIN.

WVitnesses:

A. M. PIERCE, JOHN BUOKLER.

